Originally posted by jqsiren
Someone from GTP told me if you load 1.6 editor and click FF to 74 twice then save and close, then you can do all the edits in 1.3.1 that would normally freeze the game or corrupt data. This is supposed to work, although I haven't tried it yet. I guess I'll give it a shot and post results.
I guess you sorta can. I tried adding MP4-12C turbo, ACR engine, and SL 65 AMG clutch to the '06 Viper SRT10 and when I got in-game it had 580hp/ 551PP compared to 493hp/ 535pp. The car only had about 5 miles on it when I made the changes. The only problem is that (as far as I know) 1.3.1 doesn't have turbo controller in order to have the boost gauge.
Pressing it once should be enough

To use it with Slim's tool, while using our tool, it does the modification for your current car when you click [HYBRID CAR].
Cheers,
Luca